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WorksheetsElectrical Computation
Total questions: 25
Worksheet time: 25mins
A part of an electric circuit which converts electrical energy into another form of energy to do work is ________.
control
source
circuit
load
A part of an electrical circuit, consists of batteries, generator or a main electrical power which supplies electricity is called ________.
control
source
circuit
load
The resistors are to be connected in four possible types of circuit connections namely series, parallel, series-parallel and parallel-series. Which type of connection will give the least amount of equivalent resistance?
Parallel-series
Series-parallel
Series
Parallel
What is the reason why electrical appliances are connected in parallel rather than in series?
Parallel connection consumes lesser power.
Parallel connection is simpler than series connection.
Each appliances consumes more power if connected in series.
It makes the operation of each appliance independent of each other.
A law that states that current is directly proportional to voltage and inversely proportional to resistance is known as ________.
Ohm's Law
Kirchoff's Law
Law of Resistivity
PEC
In Ohm's Law, to find the unknown voltage in the circuit, the formula to be used is:
E = I / R
E = I x R
I = E / R
R = E / I
What amount of current does a 40-watt fluorescent lamp draw from a 220 volts power source?
5.5 amperes
0.18 amperes
25.5 amperes
50.5 amperes
What is the voltage required by an automatic pressure cooker having a resistance of 20 ohms when the current flowing is 8 amperes?
120 volts
240 volts
160 volts
480 volts
In a 220-volt power line, three 50-watt incandescent bulbs are connected in parallel. How many more bulbs will light if one of the bulbs is open?
One
Two
All
None
A series connected dry cells will result to ________.
increase in the amount of current
increase in the amount of voltage
increase total resistance
more powerful supply of electricity
A small light ulb with a resistance of 100 ohms is connected across a 120-v line. What is the current through the bulb?
1.2 A
12 A
0.12 A
0.012 A
A 200-v lamp has a resistance of 400 ohms. The power rating in watts of lamp is ________.
600 w
250 w
200 w
100 w
If 18 resistances, each of a value of 36 ohms, are connected in parallel, then the total resistance is ________.
2 ohms
54 ohms
36 ohms
648 ohms
A toaster takes 10 A from a 120v line. The power used is:
12 w
130 w
1,200 w
120 w
What is the resistance of a 100 w, 110-v incandescent lamp?
121 ohms
115 ohms
125 ohms
12.1 ohms
How many kilowatts is the water heater if it draws a current of 10 amperes and has a resistance of 23 ohms?
23 Kw
2,300 Kw
230 Kw
2.3 Kw
A fluorescent lamp unit connected to a 110v AC line takes 1.2A and requires 110w power. What is its power factor?
0.9
0.833
0.866
0.8
The resistance of a 230v incandescent lamp is 300 ohms. What current is required to operate the lamp?
0.85 A
0.77 A
1.30 A
7.74 A
A group of lamps operates a current of 12 A and a voltage of 120v. What is the total power of the lamps?
1.44 kw
1.20 kw
1.34 kw
14.4 kw
What is the maximum load capacity of a 15A circuit breaker protecting a branch circuit that supplies a continuous load?
15 A
10 A
12 A
14 A
What is the horsepower rating of an electric water pump if it has a power rating of 1.75 Kw?
2 Hp
2.3 Hp
2.5 Hp
23 Hp
How many kilowatts does a certain appliance consume for 5 hours of use if it has a power rating of 1.5 Hp?
56 Kw
7.5 Kw
5.6 Kw
75 Kw
A battery is rated 200Ah. If it is used to supply a constant current of 8Ah. How long can the battery last until it becomes unusable?
20 hours
2.5 hours
15 hours
25 hours
If three equal resistances are connected in parallel, the equivalent resistance of the circuit will be ________ the value of one resistor.
three time
half
one-third
the same
Find the cost of using a 100W, 220V lamp for 20 hours at P3.00 per kW-hr?
P6.00
P9.00
P10.00
P60.00
